Quadruple dye stack (IMAGE) University of Würzburg Caption Two nanographenes (blue) with bulky substituents (grey) have each attached a PAH (red) to give a quadruple dye stack. Credit Wuerthner group / University of Wuerzburg Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.